The Flying Fisherman Cali Bifocal Reader Polarized Sunglasses feature a sleek rimless design in a medium fit. The bifocal magnifying lenses eliminate the need for switching between sunglasses and reading glasses. The sporty rectangular frames are made from TR90 Grilamid, which is a strong, lightweight, and flexible polymer for long lasting durability. Non-slip nose pads make for a comfortable, stay-put fit. They are ideal for tying knots and reading charts with magnifiers that are out of the way until needed. Polarized Polycarbonate RhinoLenses are shatterproof, eliminate glare, enhance depth and clarity, and reduce eye fatigue. AcuTint Lens Coloring System adds color contrast without distorting natural colors, allowing you to see more clearly. They provide 100% protection from harmful UVA and UVB rays.